I have been looking for a VPN that supports Multi-platform and Multi-login for me and my family, I have Macbook and an Android phone and my wife and kids have an iPhone, also I want to use a VPN for my NAS setup, I'd be great if anyone recommend me a decent service with a reasonable price package, thanks in Advance!

There are several vpn providers that offers multi-login functions. Nord, PureVPN and Ipvanish is among them. I have experienced with only 2. Nord and PureVPN. Both works well on android and iphone. Not sure of Mac, because I dont have one

Anyway, there are many reviews for vpns that you can go for before making the purchase. Try reading PureVPN review